Last updated: 2026-11-03
A camping solar system that runs a 12 V fridge, lights and a laptop, about 620 Wh a day, needs roughly 165 to 276 W of solar panels and 129 to 207 Ah of 12 V deep-cycle battery for two days without sun. Panel watts equal daily watt-hours divided by peak sun hours and an assumed 75 percent system efficiency.
By the third morning of a long weekend, the 12 V fridge has drained the battery to half and the phones are at 10 percent. A camping solar system fixes that only when the panels, the battery and the wiring are sized from one number, the daily watt-hours the gear actually uses. This guide builds that number, compares four panel classes by rated watts and daily yield, and lists what to confirm before an order.
Buying checklist: requirements to confirm
A camping solar system buying checklist has six items to confirm before comparing products: daily watt-hours, peak sun hours, system voltage, battery type, panel format and connectors. A mismatch in any one of them can leave a panel that cannot charge the battery it is wired to.
Daily watt-hours come first, and each load contributes its watts multiplied by its hours of use. The table lists assumed loads for a trailer or car-camping setup; replace them with the nameplate watts of the real gear.
| Load (assumed) | Watts | Hours per day | Watt-hours per day |
|---|---|---|---|
| 12 V compressor fridge, running time | 40 W | 10 h | 400 Wh |
| LED lights | 10 W | 4 h | 40 Wh |
| Phone and tablet charging | 30 W | 2 h | 60 Wh |
| Laptop | 60 W | 2 h | 120 Wh |
The four loads add up to 620 Wh a day, and the fridge alone is 400 Wh, a load the guide to solar panels for a 12 V camping fridge covers separately.
Penn State's AE 868 course notes on stand-alone system sizing size a system for the critical month, so the peak sun hours to use are those of the least sunny month in which the system will run. A peak sun hour is one hour of sunshine at 1,000 W/m², equal to 1 kWh/m² of solar energy. This guide assumes 5 peak sun hours in summer and 3 in winter; use your own site figure.
System voltage is 12 V for a small camping system, because the same Penn State guide states that small PV systems are usually 12 V and larger systems are preferably 48 V to handle more current. At 12 V a 200 W array carries about 17 A, from the relation amps equal watts divided by volts, so cable gauge and fuse ratings must be chosen for that current.
Panel format is compared in the next section, and battery type and connectors follow it. Each of the three changes which parts can be ordered together.
Comparison: options by spec and use case
Camping solar panel options fall into four power classes, 11 W, 100 W, 200 W and 400 W, and each class covers a different daily load. The yield column is rated watts multiplied by an assumed 5 peak sun hours and an assumed 75 percent system efficiency.
| Panel class | Rated power | Daily yield at 5 peak sun hours | Load covered |
|---|---|---|---|
| Phone-class folding panel | 11 W | 41 Wh | Phones and power banks only |
| Portable folding panel | 100 W | 375 Wh | Lights, phones and laptop (220 Wh) |
| Portable or roof panel set | 200 W | 750 Wh | Full 620 Wh budget at 5 peak sun hours, 450 Wh at 3 |
| Fixed roof array | 400 W | 1,500 Wh | Full 620 Wh budget even at 3 peak sun hours (900 Wh) |
Portable solar panels for camping are rated in watts under fixed test conditions, and real yield changes with angle, shade and temperature, which is why the 75 percent factor is an assumption to replace with measured values.
The phone-class row matches LinkSolar's portable solar panel charger for camping 11W, which lists 11 W peak power, 5 V/2.4 A USB output, 6.5 V open voltage and 2.1 A short-circuit current at 1,000 W/m², AM1.5 spectrum and 25°C. It folds to 245 × 158 × 1.5 mm and weighs 198 g, so it charges USB devices directly but does not store energy.
Folding panels and blankets are set on the ground and turned toward the sun, which fits tent and car camping, and the guide to solar panels for tent and car camping covers placement. The solar blanket versus solar suitcase comparison sets those two folding formats side by side.
Fixed roof panels suit solar power for camping trailers because the array stays wired to the battery between trips and charges whenever the trailer sits in sun. Rigid framed modules, including residential-format panels, are typically heavier per watt than folding panels and need a mounting frame, a route the guide to house solar panels for camping explains.
Low-power gear such as sensors and trackers sits below the phone class, and the mini solar panel for IoT for camping guide covers that case. Search phrases such as panel solar camping and kit solar camping blur two products: a bare panel, and a kit that adds a charge controller, battery and cables.
How battery depth of discharge changes camping solar system size
Battery depth of discharge changes the required capacity by roughly three to five times, because the Florida Solar Energy Center report FSEC-CR-1292-01 gives a design limit of up to 80 percent for deep-cycle batteries but only 15 to 25 percent for starting (SLI) batteries.
Depth of discharge is the share of a battery's rated capacity drawn out before recharging, and the Penn State guide gives an allowable range of 20 to 80 percent depending on battery type. The same guide sizes capacity as daily watt-hours times days of autonomy, divided by system voltage and by the allowed depth of discharge.
- Total the daily load: 620 Wh from the table in the checklist.
- Choose the days of autonomy: this example uses 2 days, so 620 × 2 = 1,240 Wh must be usable.
- Fix the system voltage at 12 V.
- Choose the allowed depth of discharge: this example assumes 50 percent for a deep-cycle battery.
- Divide: 1,240 / (12 × 0.5) = 207 Ah of nominal capacity.
- Size the panels for the worst-month sun: 620 / (5 × 0.75) = 165 W at 5 peak sun hours, or 620 / (3 × 0.75) = 276 W at 3.
Changing only the battery type changes the answer, as the table shows for the same 1,240 Wh of usable energy at 12 V.
| Battery and design limit | Source of the limit | Nominal capacity needed |
|---|---|---|
| Deep-cycle, 80 percent | FSEC-CR-1292-01 | 129 Ah |
| Deep-cycle, 50 percent | Assumed for this example | 207 Ah |
| Starting (SLI), 25 percent | FSEC-CR-1292-01 | 413 Ah |
| Starting (SLI), 15 percent | FSEC-CR-1292-01 | 689 Ah |
A starting battery is a poor store for camping solar: at the 15 to 25 percent limit, the same 1,240 Wh needs 413 to 689 Ah of nominal capacity.
Autonomy is a design choice, and the Penn State guide relates 3 days of autonomy at about 5 peak sun hours to about 95 percent system availability; 3 days would raise the 50 percent case to 310 Ah. The FSEC report adds that typical low-voltage disconnect settings of 11.0 to 11.5 V correspond to about 75 to 90 percent depth of discharge for nominal 12 V lead-acid batteries at low discharge rates, so a disconnect set that low allows far deeper use than the 50 percent assumed here.
Order requirements: compatibility and what to confirm
A camping solar hardware order needs four inputs from the buyer, power, size, quantity and target market, plus the compatibility details that decide whether the parts work together. Solar charging camping setups share the same compatibility checks whatever their size.
- Voltage: the panel's open-circuit voltage must stay below the controller's maximum input, and the battery voltage must match the system voltage, 12 V in the examples above.
- Current: wire and fuse ratings follow amps equal watts divided by volts, so 200 W at 12 V is about 17 A.
- Connectors: the panel lead and the controller or cable must use the same connector type, so state the type when requesting panels.
- Size and weight: compare folded dimensions and weight with the storage space or roof area; the 11 W model above is 245 × 158 × 1.5 mm folded and 198 g.
- Output: the 11 W model above has a 5 V/2.4 A USB output and 6.5 V open voltage, so it charges USB devices and is not a 12 V battery panel.
State whether the request is for panels only or a complete kit, because the compatibility checks change with the parts included. Solar for camping trailers adds the roof area and the cable run between roof and battery, which set the array size and the wire gauge.
Naming the destination market lets the supplier confirm which documents that market and its retailers ask for; this article lists none, because the requirement depends on the product and the country. Anything not stated in a written specification, such as supply or compatibility with the buyer's existing controller, stays unconfirmed until it is checked against the actual request.
FAQ
What size camping solar system do I need for a 12 V fridge?
A 12 V compressor fridge assumed to draw 40 W for 10 hours a day uses 400 Wh, which needs about 107 W of panel at 5 peak sun hours and 178 W at 3. Divide 400 by the peak sun hours and by 0.75 to get those figures. Adding the lights, phones and laptop from the checklist brings the system to the 165 to 276 W range.
How many solar panels does a camping trailer need?
A camping trailer needs enough panel watts to cover its daily watt-hours at the worst-month peak sun hours, which is 165 W at 5 hours and 276 W at 3 hours for the 620 Wh example. In 100 W modules, that is two panels at 5 hours and three at 3 hours. When planning solar for camping trailer use, roof area and the cable run to the battery set the practical limit.
Does a camping solar system need a charge controller?
Every camping solar system that charges a battery needs a charge controller, because the panel voltage has to be regulated to what the battery accepts. Panels with a built-in USB output, such as the 11 W model above, charge USB devices directly and need no controller, but they are not designed to store energy.
Next step
The next step is to send LinkSolar the four inputs this article builds toward: power in watts, panel size, quantity and target market. Prepare the daily watt-hours and system voltage from the sizing steps first, then use the camping solar requirements page: Send your requirements.